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Chemistry LibreTexts

1: General Background on Molecular Spectroscopy

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Learning Objectives

After completing this unit the student will be able to:

  • Explain what it means to use spectroscopic methods for qualitative and quantitative analysis.
  • Identify the terms in and describe deviations to Beer’s Law.
  • Describe the effect of changing the slit width and the impact it will have on qualitative and quantitative analyses.
  • Qualitatively determine the relative error in absorbance measurements and determine the optimal range for measurement purposes.
  • Describe the desirable features of a radiation source. 6. Explain the advantages of a dual versus single-beam spectrophotometer.
  • Explain the difference between a 3- and 4-level laser and why it is not possible to have a 2-level laser.
  • Compare the output of and advantages of prisms and gratings as dispersing elements.
  • Explain how a photomultiplier tube works.
  • Explain how an array detector works and describe the advantages of using an array detector.


This page titled 1: General Background on Molecular Spectroscopy is shared under a CC BY-NC 4.0 license and was authored, remixed, and/or curated by Thomas Wenzel via source content that was edited to the style and standards of the LibreTexts platform.

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